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linux_dsm_epyc7002/drivers/scsi/ibmvscsi/ibmvfc.c
Brian King 6d29cc56be [SCSI] ibmvfc: Improve LOGO/PRLO ELS handling 
There are several scenarios where the ibmvfc driver needs to
try to log back into a target on the fabric. Today when these events
occur, we simply go through re-discovery for all attached targets,
assuming that either the query of the name server or an ADISC will
indicate we might need to log back into the target, which doesn't
work for all scenarios. Fix this by taking note of the affected target(s)
in these conditions and ensuring we try to PLOGI back into the target.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-08 13:07:49 -05:00

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/*
* ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
*
* Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
*
* Copyright (C) IBM Corporation, 2008
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kthread.h>
#include <linux/of.h>
#include <linux/stringify.h>
#include <asm/firmware.h>
#include <asm/irq.h>
#include <asm/vio.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport_fc.h>
#include "ibmvfc.h"
static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
static unsigned int max_lun = IBMVFC_MAX_LUN;
static unsigned int max_targets = IBMVFC_MAX_TARGETS;
static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
static unsigned int dev_loss_tmo = IBMVFC_DEV_LOSS_TMO;
static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
static LIST_HEAD(ibmvfc_head);
static DEFINE_SPINLOCK(ibmvfc_driver_lock);
static struct scsi_transport_template *ibmvfc_transport_template;
MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION(IBMVFC_DRIVER_VERSION);
module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
"[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(default_timeout,
"Default timeout in seconds for initialization and EH commands. "
"[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
module_param_named(max_requests, max_requests, uint, S_IRUGO);
MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
"[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
module_param_named(max_lun, max_lun, uint, S_IRUGO);
MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
"[Default=" __stringify(IBMVFC_MAX_LUN) "]");
module_param_named(max_targets, max_targets, uint, S_IRUGO);
MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
"[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
"[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable driver debug information. "
"[Default=" __stringify(IBMVFC_DEBUG) "]");
module_param_named(dev_loss_tmo, dev_loss_tmo, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(dev_loss_tmo, "Maximum number of seconds that the FC "
"transport should insulate the loss of a remote port. Once this "
"value is exceeded, the scsi target is removed. "
"[Default=" __stringify(IBMVFC_DEV_LOSS_TMO) "]");
module_param_named(log_level, log_level, uint, 0);
MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
"[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
static const struct {
u16 status;
u16 error;
u8 result;
u8 retry;
int log;
char *name;
} cmd_status [] = {
{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
{ IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
{ IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
{ IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
{ IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
{ IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
{ IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
{ IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
};
static void ibmvfc_npiv_login(struct ibmvfc_host *);
static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
static void ibmvfc_npiv_logout(struct ibmvfc_host *);
static const char *unknown_error = "unknown error";
#ifdef CONFIG_SCSI_IBMVFC_TRACE
/**
* ibmvfc_trc_start - Log a start trace entry
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_trc_start(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
struct ibmvfc_trace_entry *entry;
entry = &vhost->trace[vhost->trace_index++];
entry->evt = evt;
entry->time = jiffies;
entry->fmt = evt->crq.format;
entry->type = IBMVFC_TRC_START;
switch (entry->fmt) {
case IBMVFC_CMD_FORMAT:
entry->op_code = vfc_cmd->iu.cdb[0];
entry->scsi_id = vfc_cmd->tgt_scsi_id;
entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
entry->tmf_flags = vfc_cmd->iu.tmf_flags;
entry->u.start.xfer_len = vfc_cmd->iu.xfer_len;
break;
case IBMVFC_MAD_FORMAT:
entry->op_code = mad->opcode;
break;
default:
break;
};
}
/**
* ibmvfc_trc_end - Log an end trace entry
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_trc_end(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
entry->evt = evt;
entry->time = jiffies;
entry->fmt = evt->crq.format;
entry->type = IBMVFC_TRC_END;
switch (entry->fmt) {
case IBMVFC_CMD_FORMAT:
entry->op_code = vfc_cmd->iu.cdb[0];
entry->scsi_id = vfc_cmd->tgt_scsi_id;
entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
entry->tmf_flags = vfc_cmd->iu.tmf_flags;
entry->u.end.status = vfc_cmd->status;
entry->u.end.error = vfc_cmd->error;
entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
break;
case IBMVFC_MAD_FORMAT:
entry->op_code = mad->opcode;
entry->u.end.status = mad->status;
break;
default:
break;
};
}
#else
#define ibmvfc_trc_start(evt) do { } while (0)
#define ibmvfc_trc_end(evt) do { } while (0)
#endif
/**
* ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
* @status: status / error class
* @error: error
*
* Return value:
* index into cmd_status / -EINVAL on failure
**/
static int ibmvfc_get_err_index(u16 status, u16 error)
{
int i;
for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
if ((cmd_status[i].status & status) == cmd_status[i].status &&
cmd_status[i].error == error)
return i;
return -EINVAL;
}
/**
* ibmvfc_get_cmd_error - Find the error description for the fcp response
* @status: status / error class
* @error: error
*
* Return value:
* error description string
**/
static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
{
int rc = ibmvfc_get_err_index(status, error);
if (rc >= 0)
return cmd_status[rc].name;
return unknown_error;
}
/**
* ibmvfc_get_err_result - Find the scsi status to return for the fcp response
* @vfc_cmd: ibmvfc command struct
*
* Return value:
* SCSI result value to return for completed command
**/
static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
{
int err;
struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
int fc_rsp_len = rsp->fcp_rsp_len;
if ((rsp->flags & FCP_RSP_LEN_VALID) &&
((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
rsp->data.info.rsp_code))
return DID_ERROR << 16;
err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
if (err >= 0)
return rsp->scsi_status | (cmd_status[err].result << 16);
return rsp->scsi_status | (DID_ERROR << 16);
}
/**
* ibmvfc_retry_cmd - Determine if error status is retryable
* @status: status / error class
* @error: error
*
* Return value:
* 1 if error should be retried / 0 if it should not
**/
static int ibmvfc_retry_cmd(u16 status, u16 error)
{
int rc = ibmvfc_get_err_index(status, error);
if (rc >= 0)
return cmd_status[rc].retry;
return 1;
}
static const char *unknown_fc_explain = "unknown fc explain";
static const struct {
u16 fc_explain;
char *name;
} ls_explain [] = {
{ 0x00, "no additional explanation" },
{ 0x01, "service parameter error - options" },
{ 0x03, "service parameter error - initiator control" },
{ 0x05, "service parameter error - recipient control" },
{ 0x07, "service parameter error - received data field size" },
{ 0x09, "service parameter error - concurrent seq" },
{ 0x0B, "service parameter error - credit" },
{ 0x0D, "invalid N_Port/F_Port_Name" },
{ 0x0E, "invalid node/Fabric Name" },
{ 0x0F, "invalid common service parameters" },
{ 0x11, "invalid association header" },
{ 0x13, "association header required" },
{ 0x15, "invalid originator S_ID" },
{ 0x17, "invalid OX_ID-RX-ID combination" },
{ 0x19, "command (request) already in progress" },
{ 0x1E, "N_Port Login requested" },
{ 0x1F, "Invalid N_Port_ID" },
};
static const struct {
u16 fc_explain;
char *name;
} gs_explain [] = {
{ 0x00, "no additional explanation" },
{ 0x01, "port identifier not registered" },
{ 0x02, "port name not registered" },
{ 0x03, "node name not registered" },
{ 0x04, "class of service not registered" },
{ 0x06, "initial process associator not registered" },
{ 0x07, "FC-4 TYPEs not registered" },
{ 0x08, "symbolic port name not registered" },
{ 0x09, "symbolic node name not registered" },
{ 0x0A, "port type not registered" },
{ 0xF0, "authorization exception" },
{ 0xF1, "authentication exception" },
{ 0xF2, "data base full" },
{ 0xF3, "data base empty" },
{ 0xF4, "processing request" },
{ 0xF5, "unable to verify connection" },
{ 0xF6, "devices not in a common zone" },
};
/**
* ibmvfc_get_ls_explain - Return the FC Explain description text
* @status: FC Explain status
*
* Returns:
* error string
**/
static const char *ibmvfc_get_ls_explain(u16 status)
{
int i;
for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
if (ls_explain[i].fc_explain == status)
return ls_explain[i].name;
return unknown_fc_explain;
}
/**
* ibmvfc_get_gs_explain - Return the FC Explain description text
* @status: FC Explain status
*
* Returns:
* error string
**/
static const char *ibmvfc_get_gs_explain(u16 status)
{
int i;
for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
if (gs_explain[i].fc_explain == status)
return gs_explain[i].name;
return unknown_fc_explain;
}
static const struct {
enum ibmvfc_fc_type fc_type;
char *name;
} fc_type [] = {
{ IBMVFC_FABRIC_REJECT, "fabric reject" },
{ IBMVFC_PORT_REJECT, "port reject" },
{ IBMVFC_LS_REJECT, "ELS reject" },
{ IBMVFC_FABRIC_BUSY, "fabric busy" },
{ IBMVFC_PORT_BUSY, "port busy" },
{ IBMVFC_BASIC_REJECT, "basic reject" },
};
static const char *unknown_fc_type = "unknown fc type";
/**
* ibmvfc_get_fc_type - Return the FC Type description text
* @status: FC Type error status
*
* Returns:
* error string
**/
static const char *ibmvfc_get_fc_type(u16 status)
{
int i;
for (i = 0; i < ARRAY_SIZE(fc_type); i++)
if (fc_type[i].fc_type == status)
return fc_type[i].name;
return unknown_fc_type;
}
/**
* ibmvfc_set_tgt_action - Set the next init action for the target
* @tgt: ibmvfc target struct
* @action: action to perform
*
**/
static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
enum ibmvfc_target_action action)
{
switch (tgt->action) {
case IBMVFC_TGT_ACTION_DEL_RPORT:
break;
default:
if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
tgt->add_rport = 0;
tgt->action = action;
break;
}
}
/**
* ibmvfc_set_host_state - Set the state for the host
* @vhost: ibmvfc host struct
* @state: state to set host to
*
* Returns:
* 0 if state changed / non-zero if not changed
**/
static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
enum ibmvfc_host_state state)
{
int rc = 0;
switch (vhost->state) {
case IBMVFC_HOST_OFFLINE:
rc = -EINVAL;
break;
default:
vhost->state = state;
break;
};
return rc;
}
/**
* ibmvfc_set_host_action - Set the next init action for the host
* @vhost: ibmvfc host struct
* @action: action to perform
*
**/
static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
enum ibmvfc_host_action action)
{
switch (action) {
case IBMVFC_HOST_ACTION_ALLOC_TGTS:
if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
vhost->action = action;
break;
case IBMVFC_HOST_ACTION_LOGO_WAIT:
if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
vhost->action = action;
break;
case IBMVFC_HOST_ACTION_INIT_WAIT:
if (vhost->action == IBMVFC_HOST_ACTION_INIT)
vhost->action = action;
break;
case IBMVFC_HOST_ACTION_QUERY:
switch (vhost->action) {
case IBMVFC_HOST_ACTION_INIT_WAIT:
case IBMVFC_HOST_ACTION_NONE:
case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
vhost->action = action;
break;
default:
break;
};
break;
case IBMVFC_HOST_ACTION_TGT_INIT:
if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
vhost->action = action;
break;
case IBMVFC_HOST_ACTION_LOGO:
case IBMVFC_HOST_ACTION_INIT:
case IBMVFC_HOST_ACTION_TGT_DEL:
case IBMVFC_HOST_ACTION_QUERY_TGTS:
case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
case IBMVFC_HOST_ACTION_NONE:
default:
vhost->action = action;
break;
};
}
/**
* ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
* @vhost: ibmvfc host struct
*
* Return value:
* nothing
**/
static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
{
if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
scsi_block_requests(vhost->host);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
}
} else
vhost->reinit = 1;
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_link_down - Handle a link down event from the adapter
* @vhost: ibmvfc host struct
* @state: ibmvfc host state to enter
*
**/
static void ibmvfc_link_down(struct ibmvfc_host *vhost,
enum ibmvfc_host_state state)
{
struct ibmvfc_target *tgt;
ENTER;
scsi_block_requests(vhost->host);
list_for_each_entry(tgt, &vhost->targets, queue)
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
ibmvfc_set_host_state(vhost, state);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
wake_up(&vhost->work_wait_q);
LEAVE;
}
/**
* ibmvfc_init_host - Start host initialization
* @vhost: ibmvfc host struct
* @relogin: is this a re-login?
*
* Return value:
* nothing
**/
static void ibmvfc_init_host(struct ibmvfc_host *vhost, int relogin)
{
struct ibmvfc_target *tgt;
if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
dev_err(vhost->dev,
"Host initialization retries exceeded. Taking adapter offline\n");
ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
return;
}
}
if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
if (!relogin) {
memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
vhost->async_crq.cur = 0;
}
list_for_each_entry(tgt, &vhost->targets, queue)
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
scsi_block_requests(vhost->host);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
vhost->job_step = ibmvfc_npiv_login;
wake_up(&vhost->work_wait_q);
}
}
/**
* ibmvfc_send_crq - Send a CRQ
* @vhost: ibmvfc host struct
* @word1: the first 64 bits of the data
* @word2: the second 64 bits of the data
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
{
struct vio_dev *vdev = to_vio_dev(vhost->dev);
return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
}
/**
* ibmvfc_send_crq_init - Send a CRQ init message
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
{
ibmvfc_dbg(vhost, "Sending CRQ init\n");
return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
}
/**
* ibmvfc_send_crq_init_complete - Send a CRQ init complete message
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
{
ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
}
/**
* ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
* @vhost: ibmvfc host struct
*
* Frees irq, deallocates a page for messages, unmaps dma, and unregisters
* the crq with the hypervisor.
**/
static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
{
long rc;
struct vio_dev *vdev = to_vio_dev(vhost->dev);
struct ibmvfc_crq_queue *crq = &vhost->crq;
ibmvfc_dbg(vhost, "Releasing CRQ\n");
free_irq(vdev->irq, vhost);
tasklet_kill(&vhost->tasklet);
do {
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
vhost->state = IBMVFC_NO_CRQ;
vhost->logged_in = 0;
dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
free_page((unsigned long)crq->msgs);
}
/**
* ibmvfc_reenable_crq_queue - reenables the CRQ
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
{
int rc;
struct vio_dev *vdev = to_vio_dev(vhost->dev);
/* Re-enable the CRQ */
do {
rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
if (rc)
dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
return rc;
}
/**
* ibmvfc_reset_crq - resets a crq after a failure
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
{
int rc;
struct vio_dev *vdev = to_vio_dev(vhost->dev);
struct ibmvfc_crq_queue *crq = &vhost->crq;
/* Close the CRQ */
do {
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
vhost->state = IBMVFC_NO_CRQ;
vhost->logged_in = 0;
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
/* Clean out the queue */
memset(crq->msgs, 0, PAGE_SIZE);
crq->cur = 0;
/* And re-open it again */
rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
crq->msg_token, PAGE_SIZE);
if (rc == H_CLOSED)
/* Adapter is good, but other end is not ready */
dev_warn(vhost->dev, "Partner adapter not ready\n");
else if (rc != 0)
dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
return rc;
}
/**
* ibmvfc_valid_event - Determines if event is valid.
* @pool: event_pool that contains the event
* @evt: ibmvfc event to be checked for validity
*
* Return value:
* 1 if event is valid / 0 if event is not valid
**/
static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
struct ibmvfc_event *evt)
{
int index = evt - pool->events;
if (index < 0 || index >= pool->size) /* outside of bounds */
return 0;
if (evt != pool->events + index) /* unaligned */
return 0;
return 1;
}
/**
* ibmvfc_free_event - Free the specified event
* @evt: ibmvfc_event to be freed
*
**/
static void ibmvfc_free_event(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_event_pool *pool = &vhost->pool;
BUG_ON(!ibmvfc_valid_event(pool, evt));
BUG_ON(atomic_inc_return(&evt->free) != 1);
list_add_tail(&evt->queue, &vhost->free);
}
/**
* ibmvfc_scsi_eh_done - EH done function for queuecommand commands
* @evt: ibmvfc event struct
*
* This function does not setup any error status, that must be done
* before this function gets called.
**/
static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
{
struct scsi_cmnd *cmnd = evt->cmnd;
if (cmnd) {
scsi_dma_unmap(cmnd);
cmnd->scsi_done(cmnd);
}
if (evt->eh_comp)
complete(evt->eh_comp);
ibmvfc_free_event(evt);
}
/**
* ibmvfc_fail_request - Fail request with specified error code
* @evt: ibmvfc event struct
* @error_code: error code to fail request with
*
* Return value:
* none
**/
static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
{
if (evt->cmnd) {
evt->cmnd->result = (error_code << 16);
evt->done = ibmvfc_scsi_eh_done;
} else
evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED;
list_del(&evt->queue);
del_timer(&evt->timer);
ibmvfc_trc_end(evt);
evt->done(evt);
}
/**
* ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
* @vhost: ibmvfc host struct
* @error_code: error code to fail requests with
*
* Return value:
* none
**/
static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
{
struct ibmvfc_event *evt, *pos;
ibmvfc_dbg(vhost, "Purging all requests\n");
list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
ibmvfc_fail_request(evt, error_code);
}
/**
* ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
* @vhost: struct ibmvfc host to reset
**/
static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
{
int rc;
scsi_block_requests(vhost->host);
ibmvfc_purge_requests(vhost, DID_ERROR);
if ((rc = ibmvfc_reset_crq(vhost)) ||
(rc = ibmvfc_send_crq_init(vhost)) ||
(rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
dev_err(vhost->dev, "Error after reset rc=%d\n", rc);
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
} else
ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
}
/**
* __ibmvfc_reset_host - Reset the connection to the server (no locking)
* @vhost: struct ibmvfc host to reset
**/
static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
{
if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
scsi_block_requests(vhost->host);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
vhost->job_step = ibmvfc_npiv_logout;
wake_up(&vhost->work_wait_q);
} else
ibmvfc_hard_reset_host(vhost);
}
/**
* ibmvfc_reset_host - Reset the connection to the server
* @vhost: ibmvfc host struct
**/
static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
{
unsigned long flags;
spin_lock_irqsave(vhost->host->host_lock, flags);
__ibmvfc_reset_host(vhost);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
}
/**
* ibmvfc_retry_host_init - Retry host initialization if allowed
* @vhost: ibmvfc host struct
*
* Returns: 1 if init will be retried / 0 if not
*
**/
static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
{
int retry = 0;
if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
vhost->delay_init = 1;
if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
dev_err(vhost->dev,
"Host initialization retries exceeded. Taking adapter offline\n");
ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
} else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
__ibmvfc_reset_host(vhost);
else {
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
retry = 1;
}
}
wake_up(&vhost->work_wait_q);
return retry;
}
/**
* __ibmvfc_get_target - Find the specified scsi_target (no locking)
* @starget: scsi target struct
*
* Return value:
* ibmvfc_target struct / NULL if not found
**/
static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ibmvfc_host *vhost = shost_priv(shost);
struct ibmvfc_target *tgt;
list_for_each_entry(tgt, &vhost->targets, queue)
if (tgt->target_id == starget->id) {
kref_get(&tgt->kref);
return tgt;
}
return NULL;
}
/**
* ibmvfc_get_target - Find the specified scsi_target
* @starget: scsi target struct
*
* Return value:
* ibmvfc_target struct / NULL if not found
**/
static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ibmvfc_target *tgt;
unsigned long flags;
spin_lock_irqsave(shost->host_lock, flags);
tgt = __ibmvfc_get_target(starget);
spin_unlock_irqrestore(shost->host_lock, flags);
return tgt;
}
/**
* ibmvfc_get_host_speed - Get host port speed
* @shost: scsi host struct
*
* Return value:
* none
**/
static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
{
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags;
spin_lock_irqsave(shost->host_lock, flags);
if (vhost->state == IBMVFC_ACTIVE) {
switch (vhost->login_buf->resp.link_speed / 100) {
case 1:
fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
break;
case 2:
fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
break;
case 4:
fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
break;
case 8:
fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
break;
case 10:
fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
break;
case 16:
fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
break;
default:
ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
vhost->login_buf->resp.link_speed / 100);
fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
break;
}
} else
fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
spin_unlock_irqrestore(shost->host_lock, flags);
}
/**
* ibmvfc_get_host_port_state - Get host port state
* @shost: scsi host struct
*
* Return value:
* none
**/
static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
{
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags;
spin_lock_irqsave(shost->host_lock, flags);
switch (vhost->state) {
case IBMVFC_INITIALIZING:
case IBMVFC_ACTIVE:
fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
break;
case IBMVFC_LINK_DOWN:
fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
break;
case IBMVFC_LINK_DEAD:
case IBMVFC_HOST_OFFLINE:
fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
break;
case IBMVFC_HALTED:
fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
break;
case IBMVFC_NO_CRQ:
fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
break;
default:
ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
break;
}
spin_unlock_irqrestore(shost->host_lock, flags);
}
/**
* ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
* @rport: rport struct
* @timeout: timeout value
*
* Return value:
* none
**/
static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
{
if (timeout)
rport->dev_loss_tmo = timeout;
else
rport->dev_loss_tmo = 1;
}
/**
* ibmvfc_release_tgt - Free memory allocated for a target
* @kref: kref struct
*
**/
static void ibmvfc_release_tgt(struct kref *kref)
{
struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
kfree(tgt);
}
/**
* ibmvfc_get_starget_node_name - Get SCSI target's node name
* @starget: scsi target struct
*
* Return value:
* none
**/
static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
{
struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
if (tgt)
kref_put(&tgt->kref, ibmvfc_release_tgt);
}
/**
* ibmvfc_get_starget_port_name - Get SCSI target's port name
* @starget: scsi target struct
*
* Return value:
* none
**/
static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
{
struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
if (tgt)
kref_put(&tgt->kref, ibmvfc_release_tgt);
}
/**
* ibmvfc_get_starget_port_id - Get SCSI target's port ID
* @starget: scsi target struct
*
* Return value:
* none
**/
static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
{
struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
if (tgt)
kref_put(&tgt->kref, ibmvfc_release_tgt);
}
/**
* ibmvfc_wait_while_resetting - Wait while the host resets
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
{
long timeout = wait_event_timeout(vhost->init_wait_q,
((vhost->state == IBMVFC_ACTIVE ||
vhost->state == IBMVFC_HOST_OFFLINE ||
vhost->state == IBMVFC_LINK_DEAD) &&
vhost->action == IBMVFC_HOST_ACTION_NONE),
(init_timeout * HZ));
return timeout ? 0 : -EIO;
}
/**
* ibmvfc_issue_fc_host_lip - Re-initiate link initialization
* @shost: scsi host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
{
struct ibmvfc_host *vhost = shost_priv(shost);
dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
ibmvfc_reset_host(vhost);
return ibmvfc_wait_while_resetting(vhost);
}
/**
* ibmvfc_gather_partition_info - Gather info about the LPAR
*
* Return value:
* none
**/
static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
{
struct device_node *rootdn;
const char *name;
const unsigned int *num;
rootdn = of_find_node_by_path("/");
if (!rootdn)
return;
name = of_get_property(rootdn, "ibm,partition-name", NULL);
if (name)
strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
num = of_get_property(rootdn, "ibm,partition-no", NULL);
if (num)
vhost->partition_number = *num;
of_node_put(rootdn);
}
/**
* ibmvfc_set_login_info - Setup info for NPIV login
* @vhost: ibmvfc host struct
*
* Return value:
* none
**/
static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
{
struct ibmvfc_npiv_login *login_info = &vhost->login_info;
struct device_node *of_node = vhost->dev->archdata.of_node;
const char *location;
memset(login_info, 0, sizeof(*login_info));
login_info->ostype = IBMVFC_OS_LINUX;
login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9;
login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu);
login_info->max_response = sizeof(struct ibmvfc_fcp_rsp);
login_info->partition_num = vhost->partition_number;
login_info->vfc_frame_version = 1;
login_info->fcp_version = 3;
login_info->flags = IBMVFC_FLUSH_ON_HALT;
if (vhost->client_migrated)
login_info->flags |= IBMVFC_CLIENT_MIGRATED;
login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
login_info->capabilities = IBMVFC_CAN_MIGRATE;
login_info->async.va = vhost->async_crq.msg_token;
login_info->async.len = vhost->async_crq.size * sizeof(*vhost->async_crq.msgs);
strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
strncpy(login_info->device_name,
dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
location = of_get_property(of_node, "ibm,loc-code", NULL);
location = location ? location : dev_name(vhost->dev);
strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
}
/**
* ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
* @vhost: ibmvfc host who owns the event pool
*
* Returns zero on success.
**/
static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
{
int i;
struct ibmvfc_event_pool *pool = &vhost->pool;
ENTER;
pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
if (!pool->events)
return -ENOMEM;
pool->iu_storage = dma_alloc_coherent(vhost->dev,
pool->size * sizeof(*pool->iu_storage),
&pool->iu_token, 0);
if (!pool->iu_storage) {
kfree(pool->events);
return -ENOMEM;
}
for (i = 0; i < pool->size; ++i) {
struct ibmvfc_event *evt = &pool->events[i];
atomic_set(&evt->free, 1);
evt->crq.valid = 0x80;
evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i);
evt->xfer_iu = pool->iu_storage + i;
evt->vhost = vhost;
evt->ext_list = NULL;
list_add_tail(&evt->queue, &vhost->free);
}
LEAVE;
return 0;
}
/**
* ibmvfc_free_event_pool - Frees memory of the event pool of a host
* @vhost: ibmvfc host who owns the event pool
*
**/
static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
{
int i;
struct ibmvfc_event_pool *pool = &vhost->pool;
ENTER;
for (i = 0; i < pool->size; ++i) {
list_del(&pool->events[i].queue);
BUG_ON(atomic_read(&pool->events[i].free) != 1);
if (pool->events[i].ext_list)
dma_pool_free(vhost->sg_pool,
pool->events[i].ext_list,
pool->events[i].ext_list_token);
}
kfree(pool->events);
dma_free_coherent(vhost->dev,
pool->size * sizeof(*pool->iu_storage),
pool->iu_storage, pool->iu_token);
LEAVE;
}
/**
* ibmvfc_get_event - Gets the next free event in pool
* @vhost: ibmvfc host struct
*
* Returns a free event from the pool.
**/
static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
{
struct ibmvfc_event *evt;
BUG_ON(list_empty(&vhost->free));
evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
atomic_set(&evt->free, 0);
list_del(&evt->queue);
return evt;
}
/**
* ibmvfc_init_event - Initialize fields in an event struct that are always
* required.
* @evt: The event
* @done: Routine to call when the event is responded to
* @format: SRP or MAD format
**/
static void ibmvfc_init_event(struct ibmvfc_event *evt,
void (*done) (struct ibmvfc_event *), u8 format)
{
evt->cmnd = NULL;
evt->sync_iu = NULL;
evt->crq.format = format;
evt->done = done;
evt->eh_comp = NULL;
}
/**
* ibmvfc_map_sg_list - Initialize scatterlist
* @scmd: scsi command struct
* @nseg: number of scatterlist segments
* @md: memory descriptor list to initialize
**/
static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
struct srp_direct_buf *md)
{
int i;
struct scatterlist *sg;
scsi_for_each_sg(scmd, sg, nseg, i) {
md[i].va = sg_dma_address(sg);
md[i].len = sg_dma_len(sg);
md[i].key = 0;
}
}
/**
* ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
* @scmd: Scsi_Cmnd with the scatterlist
* @evt: ibmvfc event struct
* @vfc_cmd: vfc_cmd that contains the memory descriptor
* @dev: device for which to map dma memory
*
* Returns:
* 0 on success / non-zero on failure
**/
static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
struct ibmvfc_event *evt,
struct ibmvfc_cmd *vfc_cmd, struct device *dev)
{
int sg_mapped;
struct srp_direct_buf *data = &vfc_cmd->ioba;
struct ibmvfc_host *vhost = dev_get_drvdata(dev);
sg_mapped = scsi_dma_map(scmd);
if (!sg_mapped) {
vfc_cmd->flags |= IBMVFC_NO_MEM_DESC;
return 0;
} else if (unlikely(sg_mapped < 0)) {
if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
return sg_mapped;
}
if (scmd->sc_data_direction == DMA_TO_DEVICE) {
vfc_cmd->flags |= IBMVFC_WRITE;
vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
} else {
vfc_cmd->flags |= IBMVFC_READ;
vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
}
if (sg_mapped == 1) {
ibmvfc_map_sg_list(scmd, sg_mapped, data);
return 0;
}
vfc_cmd->flags |= IBMVFC_SCATTERLIST;
if (!evt->ext_list) {
evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
&evt->ext_list_token);
if (!evt->ext_list) {
scsi_dma_unmap(scmd);
if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
return -ENOMEM;
}
}
ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
data->va = evt->ext_list_token;
data->len = sg_mapped * sizeof(struct srp_direct_buf);
data->key = 0;
return 0;
}
/**
* ibmvfc_timeout - Internal command timeout handler
* @evt: struct ibmvfc_event that timed out
*
* Called when an internally generated command times out
**/
static void ibmvfc_timeout(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
ibmvfc_reset_host(vhost);
}
/**
* ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
* @evt: event to be sent
* @vhost: ibmvfc host struct
* @timeout: timeout in seconds - 0 means do not time command
*
* Returns the value returned from ibmvfc_send_crq(). (Zero for success)
**/
static int ibmvfc_send_event(struct ibmvfc_event *evt,
struct ibmvfc_host *vhost, unsigned long timeout)
{
u64 *crq_as_u64 = (u64 *) &evt->crq;
int rc;
/* Copy the IU into the transfer area */
*evt->xfer_iu = evt->iu;
if (evt->crq.format == IBMVFC_CMD_FORMAT)
evt->xfer_iu->cmd.tag = (u64)evt;
else if (evt->crq.format == IBMVFC_MAD_FORMAT)
evt->xfer_iu->mad_common.tag = (u64)evt;
else
BUG();
list_add_tail(&evt->queue, &vhost->sent);
init_timer(&evt->timer);
if (timeout) {
evt->timer.data = (unsigned long) evt;
evt->timer.expires = jiffies + (timeout * HZ);
evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
add_timer(&evt->timer);
}
mb();
if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
list_del(&evt->queue);
del_timer(&evt->timer);
/* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
* Firmware will send a CRQ with a transport event (0xFF) to
* tell this client what has happened to the transport. This
* will be handled in ibmvfc_handle_crq()
*/
if (rc == H_CLOSED) {
if (printk_ratelimit())
dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
if (evt->cmnd)
scsi_dma_unmap(evt->cmnd);
ibmvfc_free_event(evt);
return SCSI_MLQUEUE_HOST_BUSY;
}
dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
if (evt->cmnd) {
evt->cmnd->result = DID_ERROR << 16;
evt->done = ibmvfc_scsi_eh_done;
} else
evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR;
evt->done(evt);
} else
ibmvfc_trc_start(evt);
return 0;
}
/**
* ibmvfc_log_error - Log an error for the failed command if appropriate
* @evt: ibmvfc event to log
*
**/
static void ibmvfc_log_error(struct ibmvfc_event *evt)
{
struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
struct scsi_cmnd *cmnd = evt->cmnd;
const char *err = unknown_error;
int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
int logerr = 0;
int rsp_code = 0;
if (index >= 0) {
logerr = cmd_status[index].log;
err = cmd_status[index].name;
}
if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
return;
if (rsp->flags & FCP_RSP_LEN_VALID)
rsp_code = rsp->data.info.rsp_code;
scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
"flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
}
/**
* ibmvfc_relogin - Log back into the specified device
* @sdev: scsi device struct
*
**/
static void ibmvfc_relogin(struct scsi_device *sdev)
{
struct ibmvfc_host *vhost = shost_priv(sdev->host);
struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
struct ibmvfc_target *tgt;
list_for_each_entry(tgt, &vhost->targets, queue) {
if (rport == tgt->rport) {
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
break;
}
}
ibmvfc_reinit_host(vhost);
}
/**
* ibmvfc_scsi_done - Handle responses from commands
* @evt: ibmvfc event to be handled
*
* Used as a callback when sending scsi cmds.
**/
static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
{
struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
struct scsi_cmnd *cmnd = evt->cmnd;
u32 rsp_len = 0;
u32 sense_len = rsp->fcp_sense_len;
if (cmnd) {
if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
else if (rsp->flags & FCP_RESID_UNDER)
scsi_set_resid(cmnd, rsp->fcp_resid);
else
scsi_set_resid(cmnd, 0);
if (vfc_cmd->status) {
cmnd->result = ibmvfc_get_err_result(vfc_cmd);
if (rsp->flags & FCP_RSP_LEN_VALID)
rsp_len = rsp->fcp_rsp_len;
if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
if ((vfc_cmd->status & IBMVFC_VIOS_FAILURE) && (vfc_cmd->error == IBMVFC_PLOGI_REQUIRED))
ibmvfc_relogin(cmnd->device);
if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
cmnd->result = (DID_ERROR << 16);
ibmvfc_log_error(evt);
}
if (!cmnd->result &&
(scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
cmnd->result = (DID_ERROR << 16);
scsi_dma_unmap(cmnd);
cmnd->scsi_done(cmnd);
}
if (evt->eh_comp)
complete(evt->eh_comp);
ibmvfc_free_event(evt);
}
/**
* ibmvfc_host_chkready - Check if the host can accept commands
* @vhost: struct ibmvfc host
*
* Returns:
* 1 if host can accept command / 0 if not
**/
static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
{
int result = 0;
switch (vhost->state) {
case IBMVFC_LINK_DEAD:
case IBMVFC_HOST_OFFLINE:
result = DID_NO_CONNECT << 16;
break;
case IBMVFC_NO_CRQ:
case IBMVFC_INITIALIZING:
case IBMVFC_HALTED:
case IBMVFC_LINK_DOWN:
result = DID_REQUEUE << 16;
break;
case IBMVFC_ACTIVE:
result = 0;
break;
};
return result;
}
/**
* ibmvfc_queuecommand - The queuecommand function of the scsi template
* @cmnd: struct scsi_cmnd to be executed
* @done: Callback function to be called when cmnd is completed
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_queuecommand(struct scsi_cmnd *cmnd,
void (*done) (struct scsi_cmnd *))
{
struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
struct ibmvfc_cmd *vfc_cmd;
struct ibmvfc_event *evt;
u8 tag[2];
int rc;
if (unlikely((rc = fc_remote_port_chkready(rport))) ||
unlikely((rc = ibmvfc_host_chkready(vhost)))) {
cmnd->result = rc;
done(cmnd);
return 0;
}
cmnd->result = (DID_OK << 16);
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
evt->cmnd = cmnd;
cmnd->scsi_done = done;
vfc_cmd = &evt->iu.cmd;
memset(vfc_cmd, 0, sizeof(*vfc_cmd));
vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
vfc_cmd->tgt_scsi_id = rport->port_id;
vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
if (scsi_populate_tag_msg(cmnd, tag)) {
vfc_cmd->task_tag = tag[1];
switch (tag[0]) {
case MSG_SIMPLE_TAG:
vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
break;
case MSG_HEAD_TAG:
vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
break;
case MSG_ORDERED_TAG:
vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
break;
};
}
if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
return ibmvfc_send_event(evt, vhost, 0);
ibmvfc_free_event(evt);
if (rc == -ENOMEM)
return SCSI_MLQUEUE_HOST_BUSY;
if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
scmd_printk(KERN_ERR, cmnd,
"Failed to map DMA buffer for command. rc=%d\n", rc);
cmnd->result = DID_ERROR << 16;
done(cmnd);
return 0;
}
/**
* ibmvfc_sync_completion - Signal that a synchronous command has completed
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
{
/* copy the response back */
if (evt->sync_iu)
*evt->sync_iu = *evt->xfer_iu;
complete(&evt->comp);
}
/**
* ibmvfc_reset_device - Reset the device with the specified reset type
* @sdev: scsi device to reset
* @type: reset type
* @desc: reset type description for log messages
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
{
struct ibmvfc_host *vhost = shost_priv(sdev->host);
struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
struct ibmvfc_cmd *tmf;
struct ibmvfc_event *evt = NULL;
union ibmvfc_iu rsp_iu;
struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
int rsp_rc = -EBUSY;
unsigned long flags;
int rsp_code = 0;
spin_lock_irqsave(vhost->host->host_lock, flags);
if (vhost->state == IBMVFC_ACTIVE) {
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
tmf = &evt->iu.cmd;
memset(tmf, 0, sizeof(*tmf));
tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
tmf->resp.len = sizeof(tmf->rsp);
tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
tmf->payload_len = sizeof(tmf->iu);
tmf->resp_len = sizeof(tmf->rsp);
tmf->cancel_key = (unsigned long)sdev->hostdata;
tmf->tgt_scsi_id = rport->port_id;
int_to_scsilun(sdev->lun, &tmf->iu.lun);
tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
tmf->iu.tmf_flags = type;
evt->sync_iu = &rsp_iu;
init_completion(&evt->comp);
rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (rsp_rc != 0) {
sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
desc, rsp_rc);
return -EIO;
}
sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
wait_for_completion(&evt->comp);
if (rsp_iu.cmd.status) {
if (fc_rsp->flags & FCP_RSP_LEN_VALID)
rsp_code = fc_rsp->data.info.rsp_code;
sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
"flags: %x fcp_rsp: %x, scsi_status: %x\n",
desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
fc_rsp->scsi_status);
rsp_rc = -EIO;
} else
sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
spin_lock_irqsave(vhost->host->host_lock, flags);
ibmvfc_free_event(evt);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return rsp_rc;
}
/**
* ibmvfc_abort_task_set - Abort outstanding commands to the device
* @sdev: scsi device to abort commands
*
* This sends an Abort Task Set to the VIOS for the specified device. This does
* NOT send any cancel to the VIOS. That must be done separately.
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_abort_task_set(struct scsi_device *sdev)
{
struct ibmvfc_host *vhost = shost_priv(sdev->host);
struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
struct ibmvfc_cmd *tmf;
struct ibmvfc_event *evt, *found_evt;
union ibmvfc_iu rsp_iu;
struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
int rsp_rc = -EBUSY;
unsigned long flags;
int rsp_code = 0;
spin_lock_irqsave(vhost->host->host_lock, flags);
found_evt = NULL;
list_for_each_entry(evt, &vhost->sent, queue) {
if (evt->cmnd && evt->cmnd->device == sdev) {
found_evt = evt;
break;
}
}
if (!found_evt) {
if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return 0;
}
if (vhost->state == IBMVFC_ACTIVE) {
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
tmf = &evt->iu.cmd;
memset(tmf, 0, sizeof(*tmf));
tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
tmf->resp.len = sizeof(tmf->rsp);
tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
tmf->payload_len = sizeof(tmf->iu);
tmf->resp_len = sizeof(tmf->rsp);
tmf->cancel_key = (unsigned long)sdev->hostdata;
tmf->tgt_scsi_id = rport->port_id;
int_to_scsilun(sdev->lun, &tmf->iu.lun);
tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
evt->sync_iu = &rsp_iu;
init_completion(&evt->comp);
rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (rsp_rc != 0) {
sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
return -EIO;
}
sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
wait_for_completion(&evt->comp);
if (rsp_iu.cmd.status) {
if (fc_rsp->flags & FCP_RSP_LEN_VALID)
rsp_code = fc_rsp->data.info.rsp_code;
sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
"flags: %x fcp_rsp: %x, scsi_status: %x\n",
ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
fc_rsp->scsi_status);
rsp_rc = -EIO;
} else
sdev_printk(KERN_INFO, sdev, "Abort successful\n");
spin_lock_irqsave(vhost->host->host_lock, flags);
ibmvfc_free_event(evt);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return rsp_rc;
}
/**
* ibmvfc_cancel_all - Cancel all outstanding commands to the device
* @sdev: scsi device to cancel commands
* @type: type of error recovery being performed
*
* This sends a cancel to the VIOS for the specified device. This does
* NOT send any abort to the actual device. That must be done separately.
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
{
struct ibmvfc_host *vhost = shost_priv(sdev->host);
struct scsi_target *starget = scsi_target(sdev);
struct fc_rport *rport = starget_to_rport(starget);
struct ibmvfc_tmf *tmf;
struct ibmvfc_event *evt, *found_evt;
union ibmvfc_iu rsp;
int rsp_rc = -EBUSY;
unsigned long flags;
u16 status;
ENTER;
spin_lock_irqsave(vhost->host->host_lock, flags);
found_evt = NULL;
list_for_each_entry(evt, &vhost->sent, queue) {
if (evt->cmnd && evt->cmnd->device == sdev) {
found_evt = evt;
break;
}
}
if (!found_evt) {
if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return 0;
}
if (vhost->state == IBMVFC_ACTIVE) {
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
tmf = &evt->iu.tmf;
memset(tmf, 0, sizeof(*tmf));
tmf->common.version = 1;
tmf->common.opcode = IBMVFC_TMF_MAD;
tmf->common.length = sizeof(*tmf);
tmf->scsi_id = rport->port_id;
int_to_scsilun(sdev->lun, &tmf->lun);
tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
tmf->cancel_key = (unsigned long)sdev->hostdata;
tmf->my_cancel_key = (unsigned long)starget->hostdata;
evt->sync_iu = &rsp;
init_completion(&evt->comp);
rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (rsp_rc != 0) {
sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
return -EIO;
}
sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
wait_for_completion(&evt->comp);
status = rsp.mad_common.status;
spin_lock_irqsave(vhost->host->host_lock, flags);
ibmvfc_free_event(evt);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (status != IBMVFC_MAD_SUCCESS) {
sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
return -EIO;
}
sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
return 0;
}
/**
* ibmvfc_match_target - Match function for specified target
* @evt: ibmvfc event struct
* @device: device to match (starget)
*
* Returns:
* 1 if event matches starget / 0 if event does not match starget
**/
static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
{
if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
return 1;
return 0;
}
/**
* ibmvfc_match_lun - Match function for specified LUN
* @evt: ibmvfc event struct
* @device: device to match (sdev)
*
* Returns:
* 1 if event matches sdev / 0 if event does not match sdev
**/
static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
{
if (evt->cmnd && evt->cmnd->device == device)
return 1;
return 0;
}
/**
* ibmvfc_wait_for_ops - Wait for ops to complete
* @vhost: ibmvfc host struct
* @device: device to match (starget or sdev)
* @match: match function
*
* Returns:
* SUCCESS / FAILED
**/
static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
int (*match) (struct ibmvfc_event *, void *))
{
struct ibmvfc_event *evt;
DECLARE_COMPLETION_ONSTACK(comp);
int wait;
unsigned long flags;
signed long timeout = init_timeout * HZ;
ENTER;
do {
wait = 0;
spin_lock_irqsave(vhost->host->host_lock, flags);
list_for_each_entry(evt, &vhost->sent, queue) {
if (match(evt, device)) {
evt->eh_comp = &comp;
wait++;
}
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (wait) {
timeout = wait_for_completion_timeout(&comp, timeout);
if (!timeout) {
wait = 0;
spin_lock_irqsave(vhost->host->host_lock, flags);
list_for_each_entry(evt, &vhost->sent, queue) {
if (match(evt, device)) {
evt->eh_comp = NULL;
wait++;
}
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (wait)
dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
LEAVE;
return wait ? FAILED : SUCCESS;
}
}
} while (wait);
LEAVE;
return SUCCESS;
}
/**
* ibmvfc_eh_abort_handler - Abort a command
* @cmd: scsi command to abort
*
* Returns:
* SUCCESS / FAILED
**/
static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
{
struct scsi_device *sdev = cmd->device;
struct ibmvfc_host *vhost = shost_priv(sdev->host);
int cancel_rc, abort_rc;
int rc = FAILED;
ENTER;
ibmvfc_wait_while_resetting(vhost);
cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
abort_rc = ibmvfc_abort_task_set(sdev);
if (!cancel_rc && !abort_rc)
rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
LEAVE;
return rc;
}
/**
* ibmvfc_eh_device_reset_handler - Reset a single LUN
* @cmd: scsi command struct
*
* Returns:
* SUCCESS / FAILED
**/
static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
{
struct scsi_device *sdev = cmd->device;
struct ibmvfc_host *vhost = shost_priv(sdev->host);
int cancel_rc, reset_rc;
int rc = FAILED;
ENTER;
ibmvfc_wait_while_resetting(vhost);
cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
if (!cancel_rc && !reset_rc)
rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
LEAVE;
return rc;
}
/**
* ibmvfc_dev_cancel_all - Device iterated cancel all function
* @sdev: scsi device struct
* @data: return code
*
**/
static void ibmvfc_dev_cancel_all(struct scsi_device *sdev, void *data)
{
unsigned long *rc = data;
*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
}
/**
* ibmvfc_dev_abort_all - Device iterated abort task set function
* @sdev: scsi device struct
* @data: return code
*
**/
static void ibmvfc_dev_abort_all(struct scsi_device *sdev, void *data)
{
unsigned long *rc = data;
*rc |= ibmvfc_abort_task_set(sdev);
}
/**
* ibmvfc_eh_target_reset_handler - Reset the target
* @cmd: scsi command struct
*
* Returns:
* SUCCESS / FAILED
**/
static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
{
struct scsi_device *sdev = cmd->device;
struct ibmvfc_host *vhost = shost_priv(sdev->host);
struct scsi_target *starget = scsi_target(sdev);
int reset_rc;
int rc = FAILED;
unsigned long cancel_rc = 0;
ENTER;
ibmvfc_wait_while_resetting(vhost);
starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
if (!cancel_rc && !reset_rc)
rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
LEAVE;
return rc;
}
/**
* ibmvfc_eh_host_reset_handler - Reset the connection to the server
* @cmd: struct scsi_cmnd having problems
*
**/
static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
{
int rc;
struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
dev_err(vhost->dev, "Resetting connection due to error recovery\n");
rc = ibmvfc_issue_fc_host_lip(vhost->host);
return rc ? FAILED : SUCCESS;
}
/**
* ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
* @rport: rport struct
*
* Return value:
* none
**/
static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
{
struct scsi_target *starget = to_scsi_target(&rport->dev);
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long cancel_rc = 0;
unsigned long abort_rc = 0;
int rc = FAILED;
ENTER;
starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
starget_for_each_device(starget, &abort_rc, ibmvfc_dev_abort_all);
if (!cancel_rc && !abort_rc)
rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
if (rc == FAILED)
ibmvfc_issue_fc_host_lip(shost);
LEAVE;
}
static const struct {
enum ibmvfc_async_event ae;
const char *desc;
} ae_desc [] = {
{ IBMVFC_AE_ELS_PLOGI, "PLOGI" },
{ IBMVFC_AE_ELS_LOGO, "LOGO" },
{ IBMVFC_AE_ELS_PRLO, "PRLO" },
{ IBMVFC_AE_SCN_NPORT, "N-Port SCN" },
{ IBMVFC_AE_SCN_GROUP, "Group SCN" },
{ IBMVFC_AE_SCN_DOMAIN, "Domain SCN" },
{ IBMVFC_AE_SCN_FABRIC, "Fabric SCN" },
{ IBMVFC_AE_LINK_UP, "Link Up" },
{ IBMVFC_AE_LINK_DOWN, "Link Down" },
{ IBMVFC_AE_LINK_DEAD, "Link Dead" },
{ IBMVFC_AE_HALT, "Halt" },
{ IBMVFC_AE_RESUME, "Resume" },
{ IBMVFC_AE_ADAPTER_FAILED, "Adapter Failed" },
};
static const char *unknown_ae = "Unknown async";
/**
* ibmvfc_get_ae_desc - Get text description for async event
* @ae: async event
*
**/
static const char *ibmvfc_get_ae_desc(u64 ae)
{
int i;
for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
if (ae_desc[i].ae == ae)
return ae_desc[i].desc;
return unknown_ae;
}
/**
* ibmvfc_handle_async - Handle an async event from the adapter
* @crq: crq to process
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
struct ibmvfc_host *vhost)
{
const char *desc = ibmvfc_get_ae_desc(crq->event);
struct ibmvfc_target *tgt;
ibmvfc_log(vhost, 3, "%s event received. scsi_id: %llx, wwpn: %llx,"
" node_name: %llx\n", desc, crq->scsi_id, crq->wwpn, crq->node_name);
switch (crq->event) {
case IBMVFC_AE_RESUME:
switch (crq->link_state) {
case IBMVFC_AE_LS_LINK_DOWN:
ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
break;
case IBMVFC_AE_LS_LINK_DEAD:
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
break;
case IBMVFC_AE_LS_LINK_UP:
case IBMVFC_AE_LS_LINK_BOUNCED:
default:
vhost->events_to_log |= IBMVFC_AE_LINKUP;
vhost->delay_init = 1;
__ibmvfc_reset_host(vhost);
break;
};
break;
case IBMVFC_AE_LINK_UP:
vhost->events_to_log |= IBMVFC_AE_LINKUP;
vhost->delay_init = 1;
__ibmvfc_reset_host(vhost);
break;
case IBMVFC_AE_SCN_FABRIC:
case IBMVFC_AE_SCN_DOMAIN:
vhost->events_to_log |= IBMVFC_AE_RSCN;
vhost->delay_init = 1;
__ibmvfc_reset_host(vhost);
break;
case IBMVFC_AE_SCN_NPORT:
case IBMVFC_AE_SCN_GROUP:
vhost->events_to_log |= IBMVFC_AE_RSCN;
ibmvfc_reinit_host(vhost);
break;
case IBMVFC_AE_ELS_LOGO:
case IBMVFC_AE_ELS_PRLO:
case IBMVFC_AE_ELS_PLOGI:
list_for_each_entry(tgt, &vhost->targets, queue) {
if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
break;
if (crq->scsi_id && tgt->scsi_id != crq->scsi_id)
continue;
if (crq->wwpn && tgt->ids.port_name != crq->wwpn)
continue;
if (crq->node_name && tgt->ids.node_name != crq->node_name)
continue;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
}
ibmvfc_reinit_host(vhost);
break;
case IBMVFC_AE_LINK_DOWN:
case IBMVFC_AE_ADAPTER_FAILED:
ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
break;
case IBMVFC_AE_LINK_DEAD:
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
break;
case IBMVFC_AE_HALT:
ibmvfc_link_down(vhost, IBMVFC_HALTED);
break;
default:
dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
break;
};
}
/**
* ibmvfc_handle_crq - Handles and frees received events in the CRQ
* @crq: Command/Response queue
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
{
long rc;
struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;
switch (crq->valid) {
case IBMVFC_CRQ_INIT_RSP:
switch (crq->format) {
case IBMVFC_CRQ_INIT:
dev_info(vhost->dev, "Partner initialized\n");
/* Send back a response */
rc = ibmvfc_send_crq_init_complete(vhost);
if (rc == 0)
ibmvfc_init_host(vhost, 0);
else
dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
break;
case IBMVFC_CRQ_INIT_COMPLETE:
dev_info(vhost->dev, "Partner initialization complete\n");
ibmvfc_init_host(vhost, 0);
break;
default:
dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
}
return;
case IBMVFC_CRQ_XPORT_EVENT:
vhost->state = IBMVFC_NO_CRQ;
vhost->logged_in = 0;
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
if (crq->format == IBMVFC_PARTITION_MIGRATED) {
/* We need to re-setup the interpartition connection */
dev_info(vhost->dev, "Re-enabling adapter\n");
vhost->client_migrated = 1;
ibmvfc_purge_requests(vhost, DID_REQUEUE);
if ((rc = ibmvfc_reenable_crq_queue(vhost)) ||
(rc = ibmvfc_send_crq_init(vhost))) {
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
dev_err(vhost->dev, "Error after enable (rc=%ld)\n", rc);
} else
ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
} else {
dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
ibmvfc_purge_requests(vhost, DID_ERROR);
if ((rc = ibmvfc_reset_crq(vhost)) ||
(rc = ibmvfc_send_crq_init(vhost))) {
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
dev_err(vhost->dev, "Error after reset (rc=%ld)\n", rc);
} else
ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
}
return;
case IBMVFC_CRQ_CMD_RSP:
break;
default:
dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
return;
}
if (crq->format == IBMVFC_ASYNC_EVENT)
return;
/* The only kind of payload CRQs we should get are responses to
* things we send. Make sure this response is to something we
* actually sent
*/
if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
crq->ioba);
return;
}
if (unlikely(atomic_read(&evt->free))) {
dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
crq->ioba);
return;
}
del_timer(&evt->timer);
list_del(&evt->queue);
ibmvfc_trc_end(evt);
evt->done(evt);
}
/**
* ibmvfc_scan_finished - Check if the device scan is done.
* @shost: scsi host struct
* @time: current elapsed time
*
* Returns:
* 0 if scan is not done / 1 if scan is done
**/
static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
unsigned long flags;
struct ibmvfc_host *vhost = shost_priv(shost);
int done = 0;
spin_lock_irqsave(shost->host_lock, flags);
if (time >= (init_timeout * HZ)) {
dev_info(vhost->dev, "Scan taking longer than %d seconds, "
"continuing initialization\n", init_timeout);
done = 1;
}
if (vhost->scan_complete)
done = 1;
spin_unlock_irqrestore(shost->host_lock, flags);
return done;
}
/**
* ibmvfc_slave_alloc - Setup the device's task set value
* @sdev: struct scsi_device device to configure
*
* Set the device's task set value so that error handling works as
* expected.
*
* Returns:
* 0 on success / -ENXIO if device does not exist
**/
static int ibmvfc_slave_alloc(struct scsi_device *sdev)
{
struct Scsi_Host *shost = sdev->host;
struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags = 0;
if (!rport || fc_remote_port_chkready(rport))
return -ENXIO;
spin_lock_irqsave(shost->host_lock, flags);
sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
spin_unlock_irqrestore(shost->host_lock, flags);
return 0;
}
/**
* ibmvfc_target_alloc - Setup the target's task set value
* @starget: struct scsi_target
*
* Set the target's task set value so that error handling works as
* expected.
*
* Returns:
* 0 on success / -ENXIO if device does not exist
**/
static int ibmvfc_target_alloc(struct scsi_target *starget)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags = 0;
spin_lock_irqsave(shost->host_lock, flags);
starget->hostdata = (void *)(unsigned long)vhost->task_set++;
spin_unlock_irqrestore(shost->host_lock, flags);
return 0;
}
/**
* ibmvfc_slave_configure - Configure the device
* @sdev: struct scsi_device device to configure
*
* Enable allow_restart for a device if it is a disk. Adjust the
* queue_depth here also.
*
* Returns:
* 0
**/
static int ibmvfc_slave_configure(struct scsi_device *sdev)
{
struct Scsi_Host *shost = sdev->host;
struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
unsigned long flags = 0;
spin_lock_irqsave(shost->host_lock, flags);
if (sdev->type == TYPE_DISK)
sdev->allow_restart = 1;
if (sdev->tagged_supported) {
scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
scsi_activate_tcq(sdev, sdev->queue_depth);
} else
scsi_deactivate_tcq(sdev, sdev->queue_depth);
rport->dev_loss_tmo = dev_loss_tmo;
spin_unlock_irqrestore(shost->host_lock, flags);
return 0;
}
/**
* ibmvfc_change_queue_depth - Change the device's queue depth
* @sdev: scsi device struct
* @qdepth: depth to set
*
* Return value:
* actual depth set
**/
static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
{
if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
qdepth = IBMVFC_MAX_CMDS_PER_LUN;
scsi_adjust_queue_depth(sdev, 0, qdepth);
return sdev->queue_depth;
}
/**
* ibmvfc_change_queue_type - Change the device's queue type
* @sdev: scsi device struct
* @tag_type: type of tags to use
*
* Return value:
* actual queue type set
**/
static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
{
if (sdev->tagged_supported) {
scsi_set_tag_type(sdev, tag_type);
if (tag_type)
scsi_activate_tcq(sdev, sdev->queue_depth);
else
scsi_deactivate_tcq(sdev, sdev->queue_depth);
} else
tag_type = 0;
return tag_type;
}
static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%s\n",
vhost->login_buf->resp.partition_name);
}
static ssize_t ibmvfc_show_host_device_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%s\n",
vhost->login_buf->resp.device_name);
}
static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%s\n",
vhost->login_buf->resp.port_loc_code);
}
static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%s\n",
vhost->login_buf->resp.drc_name);
}
static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
}
static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
}
/**
* ibmvfc_show_log_level - Show the adapter's error logging level
* @dev: class device struct
* @buf: buffer
*
* Return value:
* number of bytes printed to buffer
**/
static ssize_t ibmvfc_show_log_level(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags = 0;
int len;
spin_lock_irqsave(shost->host_lock, flags);
len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
spin_unlock_irqrestore(shost->host_lock, flags);
return len;
}
/**
* ibmvfc_store_log_level - Change the adapter's error logging level
* @dev: class device struct
* @buf: buffer
*
* Return value:
* number of bytes printed to buffer
**/
static ssize_t ibmvfc_store_log_level(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags = 0;
spin_lock_irqsave(shost->host_lock, flags);
vhost->log_level = simple_strtoul(buf, NULL, 10);
spin_unlock_irqrestore(shost->host_lock, flags);
return strlen(buf);
}
static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
ibmvfc_show_log_level, ibmvfc_store_log_level);
#ifdef CONFIG_SCSI_IBMVFC_TRACE
/**
* ibmvfc_read_trace - Dump the adapter trace
* @kobj: kobject struct
* @bin_attr: bin_attribute struct
* @buf: buffer
* @off: offset
* @count: buffer size
*
* Return value:
* number of bytes printed to buffer
**/
static ssize_t ibmvfc_read_trace(struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags = 0;
int size = IBMVFC_TRACE_SIZE;
char *src = (char *)vhost->trace;
if (off > size)
return 0;
if (off + count > size) {
size -= off;
count = size;
}
spin_lock_irqsave(shost->host_lock, flags);
memcpy(buf, &src[off], count);
spin_unlock_irqrestore(shost->host_lock, flags);
return count;
}
static struct bin_attribute ibmvfc_trace_attr = {
.attr = {
.name = "trace",
.mode = S_IRUGO,
},
.size = 0,
.read = ibmvfc_read_trace,
};
#endif
static struct device_attribute *ibmvfc_attrs[] = {
&dev_attr_partition_name,
&dev_attr_device_name,
&dev_attr_port_loc_code,
&dev_attr_drc_name,
&dev_attr_npiv_version,
&dev_attr_capabilities,
&dev_attr_log_level,
NULL
};
static struct scsi_host_template driver_template = {
.module = THIS_MODULE,
.name = "IBM POWER Virtual FC Adapter",
.proc_name = IBMVFC_NAME,
.queuecommand = ibmvfc_queuecommand,
.eh_abort_handler = ibmvfc_eh_abort_handler,
.eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
.eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
.eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
.slave_alloc = ibmvfc_slave_alloc,
.slave_configure = ibmvfc_slave_configure,
.target_alloc = ibmvfc_target_alloc,
.scan_finished = ibmvfc_scan_finished,
.change_queue_depth = ibmvfc_change_queue_depth,
.change_queue_type = ibmvfc_change_queue_type,
.cmd_per_lun = 16,
.can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
.this_id = -1,
.sg_tablesize = SG_ALL,
.max_sectors = IBMVFC_MAX_SECTORS,
.use_clustering = ENABLE_CLUSTERING,
.shost_attrs = ibmvfc_attrs,
};
/**
* ibmvfc_next_async_crq - Returns the next entry in async queue
* @vhost: ibmvfc host struct
*
* Returns:
* Pointer to next entry in queue / NULL if empty
**/
static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
{
struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
struct ibmvfc_async_crq *crq;
crq = &async_crq->msgs[async_crq->cur];
if (crq->valid & 0x80) {
if (++async_crq->cur == async_crq->size)
async_crq->cur = 0;
} else
crq = NULL;
return crq;
}
/**
* ibmvfc_next_crq - Returns the next entry in message queue
* @vhost: ibmvfc host struct
*
* Returns:
* Pointer to next entry in queue / NULL if empty
**/
static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
{
struct ibmvfc_crq_queue *queue = &vhost->crq;
struct ibmvfc_crq *crq;
crq = &queue->msgs[queue->cur];
if (crq->valid & 0x80) {
if (++queue->cur == queue->size)
queue->cur = 0;
} else
crq = NULL;
return crq;
}
/**
* ibmvfc_interrupt - Interrupt handler
* @irq: number of irq to handle, not used
* @dev_instance: ibmvfc_host that received interrupt
*
* Returns:
* IRQ_HANDLED
**/
static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
{
struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
unsigned long flags;
spin_lock_irqsave(vhost->host->host_lock, flags);
vio_disable_interrupts(to_vio_dev(vhost->dev));
tasklet_schedule(&vhost->tasklet);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return IRQ_HANDLED;
}
/**
* ibmvfc_tasklet - Interrupt handler tasklet
* @data: ibmvfc host struct
*
* Returns:
* Nothing
**/
static void ibmvfc_tasklet(void *data)
{
struct ibmvfc_host *vhost = data;
struct vio_dev *vdev = to_vio_dev(vhost->dev);
struct ibmvfc_crq *crq;
struct ibmvfc_async_crq *async;
unsigned long flags;
int done = 0;
spin_lock_irqsave(vhost->host->host_lock, flags);
while (!done) {
/* Pull all the valid messages off the CRQ */
while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
ibmvfc_handle_crq(crq, vhost);
crq->valid = 0;
}
/* Pull all the valid messages off the async CRQ */
while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
ibmvfc_handle_async(async, vhost);
async->valid = 0;
}
vio_enable_interrupts(vdev);
if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
vio_disable_interrupts(vdev);
ibmvfc_handle_crq(crq, vhost);
crq->valid = 0;
} else if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
vio_disable_interrupts(vdev);
ibmvfc_handle_async(async, vhost);
async->valid = 0;
} else
done = 1;
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
}
/**
* ibmvfc_init_tgt - Set the next init job step for the target
* @tgt: ibmvfc target struct
* @job_step: job step to perform
*
**/
static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
void (*job_step) (struct ibmvfc_target *))
{
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
tgt->job_step = job_step;
wake_up(&tgt->vhost->work_wait_q);
}
/**
* ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
* @tgt: ibmvfc target struct
* @job_step: initialization job step
*
* Returns: 1 if step will be retried / 0 if not
*
**/
static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
void (*job_step) (struct ibmvfc_target *))
{
if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
wake_up(&tgt->vhost->work_wait_q);
return 0;
} else
ibmvfc_init_tgt(tgt, job_step);
return 1;
}
/* Defined in FC-LS */
static const struct {
int code;
int retry;
int logged_in;
} prli_rsp [] = {
{ 0, 1, 0 },
{ 1, 0, 1 },
{ 2, 1, 0 },
{ 3, 1, 0 },
{ 4, 0, 0 },
{ 5, 0, 0 },
{ 6, 0, 1 },
{ 7, 0, 0 },
{ 8, 1, 0 },
};
/**
* ibmvfc_get_prli_rsp - Find PRLI response index
* @flags: PRLI response flags
*
**/
static int ibmvfc_get_prli_rsp(u16 flags)
{
int i;
int code = (flags & 0x0f00) >> 8;
for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
if (prli_rsp[i].code == code)
return i;
return 0;
}
/**
* ibmvfc_tgt_prli_done - Completion handler for Process Login
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
{
struct ibmvfc_target *tgt = evt->tgt;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
u32 status = rsp->common.status;
int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
switch (status) {
case IBMVFC_MAD_SUCCESS:
tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
parms->type, parms->flags, parms->service_parms);
if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
index = ibmvfc_get_prli_rsp(parms->flags);
if (prli_rsp[index].logged_in) {
if (parms->flags & IBMVFC_PRLI_EST_IMG_PAIR) {
tgt->need_login = 0;
tgt->ids.roles = 0;
if (parms->service_parms & IBMVFC_PRLI_TARGET_FUNC)
tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
if (parms->service_parms & IBMVFC_PRLI_INITIATOR_FUNC)
tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
tgt->add_rport = 1;
} else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
} else if (prli_rsp[index].retry)
ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
} else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
break;
case IBMVFC_MAD_DRIVER_FAILED:
break;
case IBMVFC_MAD_CRQ_ERROR:
ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
break;
case IBMVFC_MAD_FAILED:
default:
if (ibmvfc_retry_cmd(rsp->status, rsp->error))
level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
ibmvfc_get_cmd_error(rsp->status, rsp->error),
rsp->status, rsp->error, status);
break;
};
kref_put(&tgt->kref, ibmvfc_release_tgt);
ibmvfc_free_event(evt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_tgt_send_prli - Send a process login
* @tgt: ibmvfc target struct
*
**/
static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
{
struct ibmvfc_process_login *prli;
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
if (vhost->discovery_threads >= disc_threads)
return;
kref_get(&tgt->kref);
evt = ibmvfc_get_event(vhost);
vhost->discovery_threads++;
ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
evt->tgt = tgt;
prli = &evt->iu.prli;
memset(prli, 0, sizeof(*prli));
prli->common.version = 1;
prli->common.opcode = IBMVFC_PROCESS_LOGIN;
prli->common.length = sizeof(*prli);
prli->scsi_id = tgt->scsi_id;
prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
if (ibmvfc_send_event(evt, vhost, default_timeout)) {
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
kref_put(&tgt->kref, ibmvfc_release_tgt);
} else
tgt_dbg(tgt, "Sent process login\n");
}
/**
* ibmvfc_tgt_plogi_done - Completion handler for Port Login
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
{
struct ibmvfc_target *tgt = evt->tgt;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
u32 status = rsp->common.status;
int level = IBMVFC_DEFAULT_LOG_LEVEL;
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
switch (status) {
case IBMVFC_MAD_SUCCESS:
tgt_dbg(tgt, "Port Login succeeded\n");
if (tgt->ids.port_name &&
tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
vhost->reinit = 1;
tgt_dbg(tgt, "Port re-init required\n");
break;
}
tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
tgt->ids.port_id = tgt->scsi_id;
memcpy(&tgt->service_parms, &rsp->service_parms,
sizeof(tgt->service_parms));
memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
sizeof(tgt->service_parms_change));
ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
break;
case IBMVFC_MAD_DRIVER_FAILED:
break;
case IBMVFC_MAD_CRQ_ERROR:
ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
break;
case IBMVFC_MAD_FAILED:
default:
if (ibmvfc_retry_cmd(rsp->status, rsp->error))
level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);
break;
};
kref_put(&tgt->kref, ibmvfc_release_tgt);
ibmvfc_free_event(evt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
* @tgt: ibmvfc target struct
*
**/
static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
{
struct ibmvfc_port_login *plogi;
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
if (vhost->discovery_threads >= disc_threads)
return;
kref_get(&tgt->kref);
evt = ibmvfc_get_event(vhost);
vhost->discovery_threads++;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
evt->tgt = tgt;
plogi = &evt->iu.plogi;
memset(plogi, 0, sizeof(*plogi));
plogi->common.version = 1;
plogi->common.opcode = IBMVFC_PORT_LOGIN;
plogi->common.length = sizeof(*plogi);
plogi->scsi_id = tgt->scsi_id;
if (ibmvfc_send_event(evt, vhost, default_timeout)) {
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
kref_put(&tgt->kref, ibmvfc_release_tgt);
} else
tgt_dbg(tgt, "Sent port login\n");
}
/**
* ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
{
struct ibmvfc_target *tgt = evt->tgt;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
u32 status = rsp->common.status;
vhost->discovery_threads--;
ibmvfc_free_event(evt);
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
switch (status) {
case IBMVFC_MAD_SUCCESS:
tgt_dbg(tgt, "Implicit Logout succeeded\n");
break;
case IBMVFC_MAD_DRIVER_FAILED:
kref_put(&tgt->kref, ibmvfc_release_tgt);
wake_up(&vhost->work_wait_q);
return;
case IBMVFC_MAD_FAILED:
default:
tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
break;
};
if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
tgt->scsi_id != tgt->new_scsi_id)
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
kref_put(&tgt->kref, ibmvfc_release_tgt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
* @tgt: ibmvfc target struct
*
**/
static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
{
struct ibmvfc_implicit_logout *mad;
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
if (vhost->discovery_threads >= disc_threads)
return;
kref_get(&tgt->kref);
evt = ibmvfc_get_event(vhost);
vhost->discovery_threads++;
ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
evt->tgt = tgt;
mad = &evt->iu.implicit_logout;
memset(mad, 0, sizeof(*mad));
mad->common.version = 1;
mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
mad->common.length = sizeof(*mad);
mad->old_scsi_id = tgt->scsi_id;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
if (ibmvfc_send_event(evt, vhost, default_timeout)) {
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
kref_put(&tgt->kref, ibmvfc_release_tgt);
} else
tgt_dbg(tgt, "Sent Implicit Logout\n");
}
/**
* ibmvfc_adisc_needs_plogi - Does device need PLOGI?
* @mad: ibmvfc passthru mad struct
* @tgt: ibmvfc target struct
*
* Returns:
* 1 if PLOGI needed / 0 if PLOGI not needed
**/
static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
struct ibmvfc_target *tgt)
{
if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
sizeof(tgt->ids.port_name)))
return 1;
if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
sizeof(tgt->ids.node_name)))
return 1;
if (mad->fc_iu.response[6] != tgt->scsi_id)
return 1;
return 0;
}
/**
* ibmvfc_tgt_adisc_done - Completion handler for ADISC
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
{
struct ibmvfc_target *tgt = evt->tgt;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
u32 status = mad->common.status;
u8 fc_reason, fc_explain;
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
del_timer(&tgt->timer);
switch (status) {
case IBMVFC_MAD_SUCCESS:
tgt_dbg(tgt, "ADISC succeeded\n");
if (ibmvfc_adisc_needs_plogi(mad, tgt))
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
break;
case IBMVFC_MAD_DRIVER_FAILED:
break;
case IBMVFC_MAD_FAILED:
default:
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
fc_reason = (mad->fc_iu.response[1] & 0x00ff0000) >> 16;
fc_explain = (mad->fc_iu.response[1] & 0x0000ff00) >> 8;
tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
ibmvfc_get_cmd_error(mad->iu.status, mad->iu.error),
mad->iu.status, mad->iu.error,
ibmvfc_get_fc_type(fc_reason), fc_reason,
ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
break;
};
kref_put(&tgt->kref, ibmvfc_release_tgt);
ibmvfc_free_event(evt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_init_passthru - Initialize an event struct for FC passthru
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
{
struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
memset(mad, 0, sizeof(*mad));
mad->common.version = 1;
mad->common.opcode = IBMVFC_PASSTHRU;
mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
mad->cmd_ioba.va = (u64)evt->crq.ioba +
offsetof(struct ibmvfc_passthru_mad, iu);
mad->cmd_ioba.len = sizeof(mad->iu);
mad->iu.cmd_len = sizeof(mad->fc_iu.payload);
mad->iu.rsp_len = sizeof(mad->fc_iu.response);
mad->iu.cmd.va = (u64)evt->crq.ioba +
offsetof(struct ibmvfc_passthru_mad, fc_iu) +
offsetof(struct ibmvfc_passthru_fc_iu, payload);
mad->iu.cmd.len = sizeof(mad->fc_iu.payload);
mad->iu.rsp.va = (u64)evt->crq.ioba +
offsetof(struct ibmvfc_passthru_mad, fc_iu) +
offsetof(struct ibmvfc_passthru_fc_iu, response);
mad->iu.rsp.len = sizeof(mad->fc_iu.response);
}
/**
* ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
* @evt: ibmvfc event struct
*
* Just cleanup this event struct. Everything else is handled by
* the ADISC completion handler. If the ADISC never actually comes
* back, we still have the timer running on the ADISC event struct
* which will fire and cause the CRQ to get reset.
*
**/
static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_target *tgt = evt->tgt;
tgt_dbg(tgt, "ADISC cancel complete\n");
vhost->abort_threads--;
ibmvfc_free_event(evt);
kref_put(&tgt->kref, ibmvfc_release_tgt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_adisc_timeout - Handle an ADISC timeout
* @tgt: ibmvfc target struct
*
* If an ADISC times out, send a cancel. If the cancel times
* out, reset the CRQ. When the ADISC comes back as cancelled,
* log back into the target.
**/
static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
{
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
struct ibmvfc_tmf *tmf;
unsigned long flags;
int rc;
tgt_dbg(tgt, "ADISC timeout\n");
spin_lock_irqsave(vhost->host->host_lock, flags);
if (vhost->abort_threads >= disc_threads ||
tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
vhost->state != IBMVFC_INITIALIZING ||
vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return;
}
vhost->abort_threads++;
kref_get(&tgt->kref);
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
evt->tgt = tgt;
tmf = &evt->iu.tmf;
memset(tmf, 0, sizeof(*tmf));
tmf->common.version = 1;
tmf->common.opcode = IBMVFC_TMF_MAD;
tmf->common.length = sizeof(*tmf);
tmf->scsi_id = tgt->scsi_id;
tmf->cancel_key = tgt->cancel_key;
rc = ibmvfc_send_event(evt, vhost, default_timeout);
if (rc) {
tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
vhost->abort_threads--;
kref_put(&tgt->kref, ibmvfc_release_tgt);
__ibmvfc_reset_host(vhost);
} else
tgt_dbg(tgt, "Attempting to cancel ADISC\n");
spin_unlock_irqrestore(vhost->host->host_lock, flags);
}
/**
* ibmvfc_tgt_adisc - Initiate an ADISC for specified target
* @tgt: ibmvfc target struct
*
* When sending an ADISC we end up with two timers running. The
* first timer is the timer in the ibmvfc target struct. If this
* fires, we send a cancel to the target. The second timer is the
* timer on the ibmvfc event for the ADISC, which is longer. If that
* fires, it means the ADISC timed out and our attempt to cancel it
* also failed, so we need to reset the CRQ.
**/
static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
{
struct ibmvfc_passthru_mad *mad;
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
if (vhost->discovery_threads >= disc_threads)
return;
kref_get(&tgt->kref);
evt = ibmvfc_get_event(vhost);
vhost->discovery_threads++;
ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
evt->tgt = tgt;
ibmvfc_init_passthru(evt);
mad = &evt->iu.passthru;
mad->iu.flags = IBMVFC_FC_ELS;
mad->iu.scsi_id = tgt->scsi_id;
mad->iu.cancel_key = tgt->cancel_key;
mad->fc_iu.payload[0] = IBMVFC_ADISC;
memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
sizeof(vhost->login_buf->resp.port_name));
memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
sizeof(vhost->login_buf->resp.node_name));
mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff;
if (timer_pending(&tgt->timer))
mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
else {
tgt->timer.data = (unsigned long) tgt;
tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
add_timer(&tgt->timer);
}
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
vhost->discovery_threads--;
del_timer(&tgt->timer);
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
kref_put(&tgt->kref, ibmvfc_release_tgt);
} else
tgt_dbg(tgt, "Sent ADISC\n");
}
/**
* ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
{
struct ibmvfc_target *tgt = evt->tgt;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
u32 status = rsp->common.status;
int level = IBMVFC_DEFAULT_LOG_LEVEL;
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
switch (status) {
case IBMVFC_MAD_SUCCESS:
tgt_dbg(tgt, "Query Target succeeded\n");
tgt->new_scsi_id = rsp->scsi_id;
if (rsp->scsi_id != tgt->scsi_id)
ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
else
ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
break;
case IBMVFC_MAD_DRIVER_FAILED:
break;
case IBMVFC_MAD_CRQ_ERROR:
ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
break;
case IBMVFC_MAD_FAILED:
default:
if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);
break;
};
kref_put(&tgt->kref, ibmvfc_release_tgt);
ibmvfc_free_event(evt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_tgt_query_target - Initiate a Query Target for specified target
* @tgt: ibmvfc target struct
*
**/
static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
{
struct ibmvfc_query_tgt *query_tgt;
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
if (vhost->discovery_threads >= disc_threads)
return;
kref_get(&tgt->kref);
evt = ibmvfc_get_event(vhost);
vhost->discovery_threads++;
evt->tgt = tgt;
ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
query_tgt = &evt->iu.query_tgt;
memset(query_tgt, 0, sizeof(*query_tgt));
query_tgt->common.version = 1;
query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
query_tgt->common.length = sizeof(*query_tgt);
query_tgt->wwpn = tgt->ids.port_name;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
if (ibmvfc_send_event(evt, vhost, default_timeout)) {
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
kref_put(&tgt->kref, ibmvfc_release_tgt);
} else
tgt_dbg(tgt, "Sent Query Target\n");
}
/**
* ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
* @vhost: ibmvfc host struct
* @scsi_id: SCSI ID to allocate target for
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
{
struct ibmvfc_target *tgt;
unsigned long flags;
spin_lock_irqsave(vhost->host->host_lock, flags);
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->scsi_id == scsi_id) {
if (tgt->need_login)
ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
goto unlock_out;
}
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
if (!tgt) {
dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
scsi_id);
return -ENOMEM;
}
memset(tgt, 0, sizeof(*tgt));
tgt->scsi_id = scsi_id;
tgt->new_scsi_id = scsi_id;
tgt->vhost = vhost;
tgt->need_login = 1;
tgt->cancel_key = vhost->task_set++;
init_timer(&tgt->timer);
kref_init(&tgt->kref);
ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
spin_lock_irqsave(vhost->host->host_lock, flags);
list_add_tail(&tgt->queue, &vhost->targets);
unlock_out:
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return 0;
}
/**
* ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
* @vhost: ibmvfc host struct
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
{
int i, rc;
for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
rc = ibmvfc_alloc_target(vhost,
vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);
return rc;
}
/**
* ibmvfc_discover_targets_done - Completion handler for discover targets MAD
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
u32 mad_status = rsp->common.status;
int level = IBMVFC_DEFAULT_LOG_LEVEL;
switch (mad_status) {
case IBMVFC_MAD_SUCCESS:
ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
vhost->num_targets = rsp->num_written;
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
break;
case IBMVFC_MAD_FAILED:
level += ibmvfc_retry_host_init(vhost);
ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
break;
case IBMVFC_MAD_DRIVER_FAILED:
break;
default:
dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
break;
}
ibmvfc_free_event(evt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_discover_targets - Send Discover Targets MAD
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
{
struct ibmvfc_discover_targets *mad;
struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
mad = &evt->iu.discover_targets;
memset(mad, 0, sizeof(*mad));
mad->common.version = 1;
mad->common.opcode = IBMVFC_DISC_TARGETS;
mad->common.length = sizeof(*mad);
mad->bufflen = vhost->disc_buf_sz;
mad->buffer.va = vhost->disc_buf_dma;
mad->buffer.len = vhost->disc_buf_sz;
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
if (!ibmvfc_send_event(evt, vhost, default_timeout))
ibmvfc_dbg(vhost, "Sent discover targets\n");
else
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
}
/**
* ibmvfc_npiv_login_done - Completion handler for NPIV Login
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
u32 mad_status = evt->xfer_iu->npiv_login.common.status;
struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
unsigned int npiv_max_sectors;
int level = IBMVFC_DEFAULT_LOG_LEVEL;
switch (mad_status) {
case IBMVFC_MAD_SUCCESS:
ibmvfc_free_event(evt);
break;
case IBMVFC_MAD_FAILED:
if (ibmvfc_retry_cmd(rsp->status, rsp->error))
level += ibmvfc_retry_host_init(vhost);
else
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
ibmvfc_free_event(evt);
return;
case IBMVFC_MAD_CRQ_ERROR:
ibmvfc_retry_host_init(vhost);
case IBMVFC_MAD_DRIVER_FAILED:
ibmvfc_free_event(evt);
return;
default:
dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
ibmvfc_free_event(evt);
return;
}
vhost->client_migrated = 0;
if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
rsp->flags);
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
wake_up(&vhost->work_wait_q);
return;
}
if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
rsp->max_cmds);
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
wake_up(&vhost->work_wait_q);
return;
}
vhost->logged_in = 1;
npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
rsp->partition_name, rsp->device_name, rsp->port_loc_code,
rsp->drc_name, npiv_max_sectors);
fc_host_fabric_name(vhost->host) = rsp->node_name;
fc_host_node_name(vhost->host) = rsp->node_name;
fc_host_port_name(vhost->host) = rsp->port_name;
fc_host_port_id(vhost->host) = rsp->scsi_id;
fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
fc_host_supported_classes(vhost->host) = 0;
if (rsp->service_parms.class1_parms[0] & 0x80000000)
fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
if (rsp->service_parms.class2_parms[0] & 0x80000000)
fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
if (rsp->service_parms.class3_parms[0] & 0x80000000)
fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
fc_host_maxframe_size(vhost->host) =
rsp->service_parms.common.bb_rcv_sz & 0x0fff;
vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
vhost->host->max_sectors = npiv_max_sectors;
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_npiv_login - Sends NPIV login
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
{
struct ibmvfc_npiv_login_mad *mad;
struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
ibmvfc_gather_partition_info(vhost);
ibmvfc_set_login_info(vhost);
ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
mad = &evt->iu.npiv_login;
memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
mad->common.version = 1;
mad->common.opcode = IBMVFC_NPIV_LOGIN;
mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
mad->buffer.va = vhost->login_buf_dma;
mad->buffer.len = sizeof(*vhost->login_buf);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
if (!ibmvfc_send_event(evt, vhost, default_timeout))
ibmvfc_dbg(vhost, "Sent NPIV login\n");
else
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
};
/**
* ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
u32 mad_status = evt->xfer_iu->npiv_logout.common.status;
ibmvfc_free_event(evt);
switch (mad_status) {
case IBMVFC_MAD_SUCCESS:
if (list_empty(&vhost->sent) &&
vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
ibmvfc_init_host(vhost, 0);
return;
}
break;
case IBMVFC_MAD_FAILED:
case IBMVFC_MAD_NOT_SUPPORTED:
case IBMVFC_MAD_CRQ_ERROR:
case IBMVFC_MAD_DRIVER_FAILED:
default:
ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
break;
}
ibmvfc_hard_reset_host(vhost);
}
/**
* ibmvfc_npiv_logout - Issue an NPIV Logout
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
{
struct ibmvfc_npiv_logout_mad *mad;
struct ibmvfc_event *evt;
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
mad = &evt->iu.npiv_logout;
memset(mad, 0, sizeof(*mad));
mad->common.version = 1;
mad->common.opcode = IBMVFC_NPIV_LOGOUT;
mad->common.length = sizeof(struct ibmvfc_npiv_logout_mad);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
if (!ibmvfc_send_event(evt, vhost, default_timeout))
ibmvfc_dbg(vhost, "Sent NPIV logout\n");
else
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
}
/**
* ibmvfc_dev_init_to_do - Is there target initialization work to do?
* @vhost: ibmvfc host struct
*
* Returns:
* 1 if work to do / 0 if not
**/
static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
{
struct ibmvfc_target *tgt;
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
return 1;
}
return 0;
}
/**
* __ibmvfc_work_to_do - Is there task level work to do? (no locking)
* @vhost: ibmvfc host struct
*
* Returns:
* 1 if work to do / 0 if not
**/
static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
{
struct ibmvfc_target *tgt;
if (kthread_should_stop())
return 1;
switch (vhost->action) {
case IBMVFC_HOST_ACTION_NONE:
case IBMVFC_HOST_ACTION_INIT_WAIT:
case IBMVFC_HOST_ACTION_LOGO_WAIT:
return 0;
case IBMVFC_HOST_ACTION_TGT_INIT:
case IBMVFC_HOST_ACTION_QUERY_TGTS:
if (vhost->discovery_threads == disc_threads)
return 0;
list_for_each_entry(tgt, &vhost->targets, queue)
if (tgt->action == IBMVFC_TGT_ACTION_INIT)
return 1;
list_for_each_entry(tgt, &vhost->targets, queue)
if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
return 0;
return 1;
case IBMVFC_HOST_ACTION_LOGO:
case IBMVFC_HOST_ACTION_INIT:
case IBMVFC_HOST_ACTION_ALLOC_TGTS:
case IBMVFC_HOST_ACTION_TGT_DEL:
case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
case IBMVFC_HOST_ACTION_QUERY:
default:
break;
};
return 1;
}
/**
* ibmvfc_work_to_do - Is there task level work to do?
* @vhost: ibmvfc host struct
*
* Returns:
* 1 if work to do / 0 if not
**/
static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
{
unsigned long flags;
int rc;
spin_lock_irqsave(vhost->host->host_lock, flags);
rc = __ibmvfc_work_to_do(vhost);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return rc;
}
/**
* ibmvfc_log_ae - Log async events if necessary
* @vhost: ibmvfc host struct
* @events: events to log
*
**/
static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
{
if (events & IBMVFC_AE_RSCN)
fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
if ((events & IBMVFC_AE_LINKDOWN) &&
vhost->state >= IBMVFC_HALTED)
fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
if ((events & IBMVFC_AE_LINKUP) &&
vhost->state == IBMVFC_INITIALIZING)
fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
}
/**
* ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
* @tgt: ibmvfc target struct
*
**/
static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
{
struct ibmvfc_host *vhost = tgt->vhost;
struct fc_rport *rport;
unsigned long flags;
tgt_dbg(tgt, "Adding rport\n");
rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
spin_lock_irqsave(vhost->host->host_lock, flags);
if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
tgt_dbg(tgt, "Deleting rport\n");
list_del(&tgt->queue);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
fc_remote_port_delete(rport);
del_timer_sync(&tgt->timer);
kref_put(&tgt->kref, ibmvfc_release_tgt);
return;
}
if (rport) {
tgt_dbg(tgt, "rport add succeeded\n");
tgt->rport = rport;
rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
rport->supported_classes = 0;
tgt->target_id = rport->scsi_target_id;
if (tgt->service_parms.class1_parms[0] & 0x80000000)
rport->supported_classes |= FC_COS_CLASS1;
if (tgt->service_parms.class2_parms[0] & 0x80000000)
rport->supported_classes |= FC_COS_CLASS2;
if (tgt->service_parms.class3_parms[0] & 0x80000000)
rport->supported_classes |= FC_COS_CLASS3;
} else
tgt_dbg(tgt, "rport add failed\n");
spin_unlock_irqrestore(vhost->host->host_lock, flags);
}
/**
* ibmvfc_do_work - Do task level work
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_do_work(struct ibmvfc_host *vhost)
{
struct ibmvfc_target *tgt;
unsigned long flags;
struct fc_rport *rport;
ibmvfc_log_ae(vhost, vhost->events_to_log);
spin_lock_irqsave(vhost->host->host_lock, flags);
vhost->events_to_log = 0;
switch (vhost->action) {
case IBMVFC_HOST_ACTION_NONE:
case IBMVFC_HOST_ACTION_LOGO_WAIT:
case IBMVFC_HOST_ACTION_INIT_WAIT:
break;
case IBMVFC_HOST_ACTION_LOGO:
vhost->job_step(vhost);
break;
case IBMVFC_HOST_ACTION_INIT:
BUG_ON(vhost->state != IBMVFC_INITIALIZING);
if (vhost->delay_init) {
vhost->delay_init = 0;
spin_unlock_irqrestore(vhost->host->host_lock, flags);
ssleep(15);
return;
} else
vhost->job_step(vhost);
break;
case IBMVFC_HOST_ACTION_QUERY:
list_for_each_entry(tgt, &vhost->targets, queue)
ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
break;
case IBMVFC_HOST_ACTION_QUERY_TGTS:
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
tgt->job_step(tgt);
break;
}
}
if (!ibmvfc_dev_init_to_do(vhost))
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
break;
case IBMVFC_HOST_ACTION_TGT_DEL:
case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
tgt_dbg(tgt, "Deleting rport\n");
rport = tgt->rport;
tgt->rport = NULL;
list_del(&tgt->queue);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (rport)
fc_remote_port_delete(rport);
del_timer_sync(&tgt->timer);
kref_put(&tgt->kref, ibmvfc_release_tgt);
return;
}
}
if (vhost->state == IBMVFC_INITIALIZING) {
if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
if (vhost->reinit) {
vhost->reinit = 0;
scsi_block_requests(vhost->host);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
} else {
ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
wake_up(&vhost->init_wait_q);
schedule_work(&vhost->rport_add_work_q);
vhost->init_retries = 0;
spin_unlock_irqrestore(vhost->host->host_lock, flags);
scsi_unblock_requests(vhost->host);
}
return;
} else {
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
vhost->job_step = ibmvfc_discover_targets;
}
} else {
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
scsi_unblock_requests(vhost->host);
wake_up(&vhost->init_wait_q);
return;
}
break;
case IBMVFC_HOST_ACTION_ALLOC_TGTS:
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
ibmvfc_alloc_targets(vhost);
spin_lock_irqsave(vhost->host->host_lock, flags);
break;
case IBMVFC_HOST_ACTION_TGT_INIT:
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
tgt->job_step(tgt);
break;
}
}
if (!ibmvfc_dev_init_to_do(vhost))
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
break;
default:
break;
};
spin_unlock_irqrestore(vhost->host->host_lock, flags);
}
/**
* ibmvfc_work - Do task level work
* @data: ibmvfc host struct
*
* Returns:
* zero
**/
static int ibmvfc_work(void *data)
{
struct ibmvfc_host *vhost = data;
int rc;
set_user_nice(current, -20);
while (1) {
rc = wait_event_interruptible(vhost->work_wait_q,
ibmvfc_work_to_do(vhost));
BUG_ON(rc);
if (kthread_should_stop())
break;
ibmvfc_do_work(vhost);
}
ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
return 0;
}
/**
* ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
* @vhost: ibmvfc host struct
*
* Allocates a page for messages, maps it for dma, and registers
* the crq with the hypervisor.
*
* Return value:
* zero on success / other on failure
**/
static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
{
int rc, retrc = -ENOMEM;
struct device *dev = vhost->dev;
struct vio_dev *vdev = to_vio_dev(dev);
struct ibmvfc_crq_queue *crq = &vhost->crq;
ENTER;
crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
if (!crq->msgs)
return -ENOMEM;
crq->size = PAGE_SIZE / sizeof(*crq->msgs);
crq->msg_token = dma_map_single(dev, crq->msgs,
PAGE_SIZE, DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, crq->msg_token))
goto map_failed;
retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
crq->msg_token, PAGE_SIZE);
if (rc == H_RESOURCE)
/* maybe kexecing and resource is busy. try a reset */
retrc = rc = ibmvfc_reset_crq(vhost);
if (rc == H_CLOSED)
dev_warn(dev, "Partner adapter not ready\n");
else if (rc) {
dev_warn(dev, "Error %d opening adapter\n", rc);
goto reg_crq_failed;
}
retrc = 0;
tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
goto req_irq_failed;
}
if ((rc = vio_enable_interrupts(vdev))) {
dev_err(dev, "Error %d enabling interrupts\n", rc);
goto req_irq_failed;
}
crq->cur = 0;
LEAVE;
return retrc;
req_irq_failed:
tasklet_kill(&vhost->tasklet);
do {
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
reg_crq_failed:
dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
map_failed:
free_page((unsigned long)crq->msgs);
return retrc;
}
/**
* ibmvfc_free_mem - Free memory for vhost
* @vhost: ibmvfc host struct
*
* Return value:
* none
**/
static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
{
struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
ENTER;
mempool_destroy(vhost->tgt_pool);
kfree(vhost->trace);
dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
vhost->disc_buf_dma);
dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
vhost->login_buf, vhost->login_buf_dma);
dma_pool_destroy(vhost->sg_pool);
dma_unmap_single(vhost->dev, async_q->msg_token,
async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
free_page((unsigned long)async_q->msgs);
LEAVE;
}
/**
* ibmvfc_alloc_mem - Allocate memory for vhost
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / non-zero on failure
**/
static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
{
struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
struct device *dev = vhost->dev;
ENTER;
async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
if (!async_q->msgs) {
dev_err(dev, "Couldn't allocate async queue.\n");
goto nomem;
}
async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
async_q->msg_token = dma_map_single(dev, async_q->msgs,
async_q->size * sizeof(*async_q->msgs),
DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, async_q->msg_token)) {
dev_err(dev, "Failed to map async queue\n");
goto free_async_crq;
}
vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
SG_ALL * sizeof(struct srp_direct_buf),
sizeof(struct srp_direct_buf), 0);
if (!vhost->sg_pool) {
dev_err(dev, "Failed to allocate sg pool\n");
goto unmap_async_crq;
}
vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
&vhost->login_buf_dma, GFP_KERNEL);
if (!vhost->login_buf) {
dev_err(dev, "Couldn't allocate NPIV login buffer\n");
goto free_sg_pool;
}
vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
&vhost->disc_buf_dma, GFP_KERNEL);
if (!vhost->disc_buf) {
dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
goto free_login_buffer;
}
vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
if (!vhost->trace)
goto free_disc_buffer;
vhost->tgt_pool = mempool_create_kzalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
sizeof(struct ibmvfc_target));
if (!vhost->tgt_pool) {
dev_err(dev, "Couldn't allocate target memory pool\n");
goto free_trace;
}
LEAVE;
return 0;
free_trace:
kfree(vhost->trace);
free_disc_buffer:
dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
vhost->disc_buf_dma);
free_login_buffer:
dma_free_coherent(dev, sizeof(*vhost->login_buf),
vhost->login_buf, vhost->login_buf_dma);
free_sg_pool:
dma_pool_destroy(vhost->sg_pool);
unmap_async_crq:
dma_unmap_single(dev, async_q->msg_token,
async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
free_async_crq:
free_page((unsigned long)async_q->msgs);
nomem:
LEAVE;
return -ENOMEM;
}
/**
* ibmvfc_rport_add_thread - Worker thread for rport adds
* @work: work struct
*
**/
static void ibmvfc_rport_add_thread(struct work_struct *work)
{
struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
rport_add_work_q);
struct ibmvfc_target *tgt;
struct fc_rport *rport;
unsigned long flags;
int did_work;
ENTER;
spin_lock_irqsave(vhost->host->host_lock, flags);
do {
did_work = 0;
if (vhost->state != IBMVFC_ACTIVE)
break;
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->add_rport) {
did_work = 1;
tgt->add_rport = 0;
kref_get(&tgt->kref);
rport = tgt->rport;
if (!rport) {
spin_unlock_irqrestore(vhost->host->host_lock, flags);
ibmvfc_tgt_add_rport(tgt);
} else if (get_device(&rport->dev)) {
spin_unlock_irqrestore(vhost->host->host_lock, flags);
tgt_dbg(tgt, "Setting rport roles\n");
fc_remote_port_rolechg(rport, tgt->ids.roles);
put_device(&rport->dev);
}
kref_put(&tgt->kref, ibmvfc_release_tgt);
spin_lock_irqsave(vhost->host->host_lock, flags);
break;
}
}
} while(did_work);
if (vhost->state == IBMVFC_ACTIVE)
vhost->scan_complete = 1;
spin_unlock_irqrestore(vhost->host->host_lock, flags);
LEAVE;
}
/**
* ibmvfc_probe - Adapter hot plug add entry point
* @vdev: vio device struct
* @id: vio device id struct
*
* Return value:
* 0 on success / non-zero on failure
**/
static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
struct ibmvfc_host *vhost;
struct Scsi_Host *shost;
struct device *dev = &vdev->dev;
int rc = -ENOMEM;
ENTER;
shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
if (!shost) {
dev_err(dev, "Couldn't allocate host data\n");
goto out;
}
shost->transportt = ibmvfc_transport_template;
shost->can_queue = max_requests;
shost->max_lun = max_lun;
shost->max_id = max_targets;
shost->max_sectors = IBMVFC_MAX_SECTORS;
shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
shost->unique_id = shost->host_no;
vhost = shost_priv(shost);
INIT_LIST_HEAD(&vhost->sent);
INIT_LIST_HEAD(&vhost->free);
INIT_LIST_HEAD(&vhost->targets);
sprintf(vhost->name, IBMVFC_NAME);
vhost->host = shost;
vhost->dev = dev;
vhost->partition_number = -1;
vhost->log_level = log_level;
vhost->task_set = 1;
strcpy(vhost->partition_name, "UNKNOWN");
init_waitqueue_head(&vhost->work_wait_q);
init_waitqueue_head(&vhost->init_wait_q);
INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
if ((rc = ibmvfc_alloc_mem(vhost)))
goto free_scsi_host;
vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
shost->host_no);
if (IS_ERR(vhost->work_thread)) {
dev_err(dev, "Couldn't create kernel thread: %ld\n",
PTR_ERR(vhost->work_thread));
goto free_host_mem;
}
if ((rc = ibmvfc_init_crq(vhost))) {
dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
goto kill_kthread;
}
if ((rc = ibmvfc_init_event_pool(vhost))) {
dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
goto release_crq;
}
if ((rc = scsi_add_host(shost, dev)))
goto release_event_pool;
if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
&ibmvfc_trace_attr))) {
dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
goto remove_shost;
}
dev_set_drvdata(dev, vhost);
spin_lock(&ibmvfc_driver_lock);
list_add_tail(&vhost->queue, &ibmvfc_head);
spin_unlock(&ibmvfc_driver_lock);
ibmvfc_send_crq_init(vhost);
scsi_scan_host(shost);
return 0;
remove_shost:
scsi_remove_host(shost);
release_event_pool:
ibmvfc_free_event_pool(vhost);
release_crq:
ibmvfc_release_crq_queue(vhost);
kill_kthread:
kthread_stop(vhost->work_thread);
free_host_mem:
ibmvfc_free_mem(vhost);
free_scsi_host:
scsi_host_put(shost);
out:
LEAVE;
return rc;
}
/**
* ibmvfc_remove - Adapter hot plug remove entry point
* @vdev: vio device struct
*
* Return value:
* 0
**/
static int ibmvfc_remove(struct vio_dev *vdev)
{
struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
unsigned long flags;
ENTER;
ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
ibmvfc_wait_while_resetting(vhost);
ibmvfc_release_crq_queue(vhost);
kthread_stop(vhost->work_thread);
fc_remove_host(vhost->host);
scsi_remove_host(vhost->host);
spin_lock_irqsave(vhost->host->host_lock, flags);
ibmvfc_purge_requests(vhost, DID_ERROR);
ibmvfc_free_event_pool(vhost);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
ibmvfc_free_mem(vhost);
spin_lock(&ibmvfc_driver_lock);
list_del(&vhost->queue);
spin_unlock(&ibmvfc_driver_lock);
scsi_host_put(vhost->host);
LEAVE;
return 0;
}
/**
* ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
* @vdev: vio device struct
*
* Return value:
* Number of bytes the driver will need to DMA map at the same time in
* order to perform well.
*/
static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
{
unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
}
static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
{"fcp", "IBM,vfc-client"},
{ "", "" }
};
MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
static struct vio_driver ibmvfc_driver = {
.id_table = ibmvfc_device_table,
.probe = ibmvfc_probe,
.remove = ibmvfc_remove,
.get_desired_dma = ibmvfc_get_desired_dma,
.driver = {
.name = IBMVFC_NAME,
.owner = THIS_MODULE,
}
};
static struct fc_function_template ibmvfc_transport_functions = {
.show_host_fabric_name = 1,
.show_host_node_name = 1,
.show_host_port_name = 1,
.show_host_supported_classes = 1,
.show_host_port_type = 1,
.show_host_port_id = 1,
.show_host_maxframe_size = 1,
.get_host_port_state = ibmvfc_get_host_port_state,
.show_host_port_state = 1,
.get_host_speed = ibmvfc_get_host_speed,
.show_host_speed = 1,
.issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
.terminate_rport_io = ibmvfc_terminate_rport_io,
.show_rport_maxframe_size = 1,
.show_rport_supported_classes = 1,
.set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
.show_rport_dev_loss_tmo = 1,
.get_starget_node_name = ibmvfc_get_starget_node_name,
.show_starget_node_name = 1,
.get_starget_port_name = ibmvfc_get_starget_port_name,
.show_starget_port_name = 1,
.get_starget_port_id = ibmvfc_get_starget_port_id,
.show_starget_port_id = 1,
};
/**
* ibmvfc_module_init - Initialize the ibmvfc module
*
* Return value:
* 0 on success / other on failure
**/
static int __init ibmvfc_module_init(void)
{
int rc;
if (!firmware_has_feature(FW_FEATURE_VIO))
return -ENODEV;
printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
if (!ibmvfc_transport_template)
return -ENOMEM;
rc = vio_register_driver(&ibmvfc_driver);
if (rc)
fc_release_transport(ibmvfc_transport_template);
return rc;
}
/**
* ibmvfc_module_exit - Teardown the ibmvfc module
*
* Return value:
* nothing
**/
static void __exit ibmvfc_module_exit(void)
{
vio_unregister_driver(&ibmvfc_driver);
fc_release_transport(ibmvfc_transport_template);
}
module_init(ibmvfc_module_init);
module_exit(ibmvfc_module_exit);
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